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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Performance Analysis of the Molten-Salt Thermal Storage System Filled by PCM Capsules with Cascaded Melting Temperatures

Chao Xu
MOE Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Beijing 102206, China

Ming Wu
Xi’an Jiaotong University, 28 Xian Ning West Rd., Xi’an 710049, China

Xing Ju
North China Electric Power University, 2 Bei Nong Rd., Changping District, Beijing 102206, China




Xiaoze Du
Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (North China Electric Power University), Ministry of Education, Beijing 102206, China; School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China

Ya-Ling He
Key Laboratory of Thermo-fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China

Yuanyuan Li
Department of Aerospace and Mechanical Engineering The University of Arizona Tucson, AZ 85721, USA; School of Energy, Power and Mechanical Engineering North China Electric Power University Beijing, China

DOI: 10.1615/IHTC15.tst.008753
pages 9117-9130


MOTS CLÉS: Thermal storage, Numerical simulation and super-computing, Thermocline, Packed bed, PCM

Résumé

We present a transient, one-dimensional dispersion-concentric (D-C) model to numerically study the charging and discharging behaviors of the molten-salt thermal energy storage system filled by PCM capsules with cascaded phase change temperatures (PCTs). Three different storage systems including the non-cascaded system, the cascaded system with 3 PCTs and the cascaded system with 5 PCTs are investigated. Detailed characteristics of heat transfer between molten salt and the packed PCM capsules are revealed, and various numerical results are examined, including the temperature distributions of molten salt and PCM capsules, the variations in the molten-salt outlet temperature, the accumulated charging and discharging ratios, etc. The results show that for cascaded systems, some stored latent heat in PCM capsules with relatively lower PCTs may not be effectively used. On the other hand, the non-cascaded system could suffer from low accumulated charging ratio and much longer charging time due to the constrains of PCT. The cascaded systems especially with 5 cascaded PCTs are found to have both a fast discharging rate and a fast charging rate, and thus cascaded systems are very promising to be used as the compact high-temperature TES system using liquid as the heat transfer fluid.

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